Medium arch signature Superfeet shape adds stability and comfort to your shoes, reducing stress on feet, ankles, knees, and back.. Improves efficiency, reduces fatigue, and supports every step. Responsive EVOLyte® carbon fibre cap and two layers of Aerospring Rebound foam combine to deliver exceptional comfort and smooth and efficient energy transfer through your gait from foot strike to toe off. Made to replace the removable liner in moderate to tight-fitting shoes.. Features. Medium arch orthotic support helps stabilise the foot as you move, reducing stress on feet, ankles, knees, and back. Heel cup positions and cradles the heel to optimise natural shock absorption and minimise fatigue. Stabiliser cap with proprietary EVOLyte® carbon fibre and polymer blend responds to compression, springing back to its original shape for responsive, weight-defying support. Moisturewick™ top cover helps reduce odours and keeps feet fresh. Two layers of heel-to-toe Aerospring™ Rebound comfort foam deliver ultimate comfort in every step